Liquid crystal display device and backlight module thereof

Abstract

The invention discloses a backlight module. The backlight module comprises a substrate, a light guide plate, a first column body, light sources, a spacer and an elastic component, wherein the light guide plate is arranged on the substrate; a light-emitting device of each light source is arranged toward a first side edge of the light guide plate; by the adoption of the spacer, a minimum distance is reserved between the first side edge of the light guide plate and the light-emitting device of each light source; at least part of the first column body is fixed on the light guide plate; a first end of the elastic component is connected to the end, which penetrates through a slit of the substrate, of the first column body; a second end of the elastic component is connected to the substrate; compared with the first end of the elastic component, the second end of the elastic component is further away from the first side edge of the light guide plate; and the elastic component pushes the first column body to drive the light guide plate to move toward the light sources until the distance between the light guide plate and the light emitting device of each light source reaches the minimum distance. The invention also discloses a liquid crystal display device. By the backlight module and the liquid crystal display device, the possibility that the distance of coupled light changes is reduced, and the luminance of the module is kept consistent with a design value well.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display device and a backlight module thereof. Background technique [0002] In the side-type LED backlight module, the light coupling efficiency is an important factor affecting the brightness of the backlight module, and the light coupling efficiency is the efficiency with which the light energy of the LED is transmitted into the light guide plate. The light coupling efficiency is related to the light coupling distance, and the light coupling distance is the distance between the end surface of the light-emitting surface of the LED and the end surface of the light-incoming surface of the light guide plate. [0003] refer to figure 1 , figure 1 It is a schematic cross-sectional view of a side-in LED backlight module in the prior art, and the distance d between the LED 10 and the light guide plate 11 is the light coupling distance. Different ligh...

AI Technical Summary

Problems solved by technology

[0004] In the long-term research and development, the inventors of the present application found that due to the existence of problems such as structural parameter tolerances of various components, assembly deviations, thermal expansion of the light guide plate, etc., the light coupling distance may deviate from the design value, for example, the light coupling distance deviation Large, which in turn affects the brightness of the backlight module

Images